Terminals Of ECM

Fig 1: Identifying B33 And A36 ECM Connector Terminals

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HINT:

The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

1. WAVEFORM 1 

   Camshaft timing oil control valve (OCV) 

   WAVEFORM REFERENCE (WAVEFORM 1)
   
   

   ECM Terminal Name	Between OC1+ and OC1-
   Tester Range	5 v/DIV, 1 ms/DIV
   Condition	Idling

   Fig 2: Waveform Graph (Waveform 1)

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2. WAVEFORM 2 

   Air fuel ration sensor (sensor 1) heater 

   WAVEFORM REFERENCE (WAVEFORM 2)
   
   

   ECM Terminal Name	Between HA1A and E04
   Tester Range	5 v/DIV, 10 ms/DIV
   Condition	Idling with warm engine

   HINT:

   The wavelength varies in accordance with the engine operating condition.

   Fig 3: Waveform Graph (Waveform 2)

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3. WAVEFORM 3 

   Heated oxygen sensor (sensor 2) 

   WAVEFORM REFERENCE (WAVEFORM 3)
   
   

   ECM Terminal Name	Between OX1B and EX1B
   Tester Range	0.2 v/DIV, 200 ms/DIV
   Condition	Engine speed maintained at 2,500 rpm for 2 minutes after warming up sensor

   HINT:

   In DATA LIST, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

   Fig 4: Waveform Graph (Waveform 3)

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4. WAVEFORM 4 

   Injector No. 1 (to No. 4) injection signal 

   WAVEFORM REFERENCE (WAVEFORM 4)
   
   

   ECM Terminal Name	Between #10 (to #40) and E01
   Tester Range	20 v/DIV, 20 ms/DIV
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 5: Waveform Graph (Waveform 4)

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5. WAVEFORM 5 

   Knock sensor 

   WAVEFORM REFERENCE (WAVEFORM 5)
   
   

   ECM Terminal Name	Between KNK1 and EKNK
   Tester Range	1 v/DIV, 1 ms/DIV
   Condition	Engine speed maintained at 4,000 rpm after warming up engine

   HINT:

   • The wavelength becomes shorter as the engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
     Fig 6: Waveform Graph (Waveform 5)

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6. WAVEFORM 6 

   Crankshaft position sensor and Camshaft position sensor 

   WAVEFORM REFERENCE (WAVEFORM 6)
   
   

   ECM Terminal Name	CH1: Between G2+ and G2- CH2: Between NE+ and NE-
   Tester Range	5 v/DIV, 20 ms/DIV
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 7: Waveform Graph (Waveform 6)

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7. WAVEFORM 7 

   Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM) 

   WAVEFORM REFERENCE (WAVEFORM 7)
   
   

   ECM Terminal Name	Between IGT (1 to 4) and E1 Between IGF1 and E1
   Tester Range	2 v/DIV, 20 ms/DIV
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 8: Waveform Graph (Waveform 7)

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8. WAVEFORM 8 

   Purge VSV 

   WAVEFORM REFERENCE (WAVEFORM 8)
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	10 v/DIV, 20 ms/DIV
   Condition	Idling

   HINT:

   If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

   Fig 9: Waveform Graph (Waveform 8)

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9. WAVEFORM 9 

   Vehicle speed signal 

   WAVEFORM REFERENCE (WAVEFORM 9)
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	2 v/DIV, 20 ms/DIV
   Condition	Driving at 20 km/h (12 mph)

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

   Fig 10: Waveform Graph (Waveform 9)

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10. WAVEFORM 10 

    Throttle actuator positive terminal 

    WAVEFORM REFERENCE (WAVEFORM 10)
    
    

    ECM Terminal Name	Between M+ and ME01
    Tester Range	5 v/DIV, 1 ms/DIV
    Condition	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Waveform Graph (Waveform 10)

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11. WAVEFORM 11 

    Throttle actuator negative terminal 

    WAVEFORM REFERENCE (WAVEFORM 11)
    
    

    ECM Terminal Name	Between M- and ME01
    Tester Range	5 v/DIV, 1 ms/DIV
    Condition	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 12: Waveform Graph (Waveform 11)

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12. WAVEFORM 12 

    Engine speed signal 

    WAVEFORM REFERENCE (WAVEFORM 12)
    
    

    ECM Terminal Name	Between TACH and E1
    Tester Range	5 v/DIV, 10 ms/DIV
    Condition	Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 13: Waveform Graph (Waveform 12)

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13. WAVEFORM 13 

    CAN communication signal (Reference) 

    WAVEFORM REFERENCE (WAVEFORM 13)
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 v/DIV, 10 μs/DIV
    Condition	Engine stops and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: Waveform Graph (Waveform 13)

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14. WAVEFORM 14 

    CAN communication signal (Reference) 

    WAVEFORM REFERENCE (WAVEFORM 14)
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 v/DIV, 10 μs/DIV
    Condition	Engine stops and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 15: Waveform Graph (Waveform 14)

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